Nus pyke



(No Model.)

L S M PYKE & E S HARRIS FIELD MAGNET FOR DYNAMO ELECTRIC MACHINES.

Patented'June 14, 1892.

UNITED, STATES PATENT OFFICE.

LAZARUS SIMON MAGNUS PYKE AND EDWARD STEPHEN HARRIS, OF

LONDON, ENGLAND.

FIELD-MAGNET FOR DYNAMO-ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No..476,819, dated June 14, 1892.

Application filed February 5, 1892. Serial No. 420.470- (N0 model.) 4

To all whom it may concern:

Be it known that we, LAZARUS SIMON MAG- NUS PYKE and EDWARD STEPHEN HARRIS, electrical engineers and contractors, both of 3i New Tothill Street. in the city of London, England, have invent-ad new and useful Improvements in Field Magnets of Dynamo- Electric Machines, of which the following is a full, clear, and exact description.

These improvements relate to that class of alternating-cu rrent dynamo-electric machines in which the field-inducing wire consists of or acts as a single coil.

The improvements consist, first, in the combination,with the said coil, of amass of magnetic metal surrounding the coil on its inner and outer circumference and on one face and extending beyond the coil at the other face. andof sets of flat annular lamime fitting on and .in the cylindrical extensions of the magnetic mass, so as to form acontinuation thereof, the said fiat annularlaminae being formed with polar projections or extensions suitably designed, according to the class of generating armature or coil to be used in connection therewith, the two sets of laminae opposing each other and inclosing the field-coil on the open face, except at a narrow zone suflicient for the rotation between thetwo sets of polar extensions of the armature or inductors.

Reference is to be had to the accompanying drawings, forming part .of this specification,

. wherein-- Figure l is a vertical longitudinal section of the improved machine. Fig. 2 is an end elevation thereof, one half the inductors and their carrierbeing removed to show the fieldmagnct. Fig. 3 is a detail section and part edge view of one set of the laminated rings and polar projections.

The same letters of reference indicate the same parts in all the figures. v

A is the magnetic mass inclosing on three sides an annular space, in which is contained the field-inducing coil B, which is connected to the terminals 1) b and supplied with current from an exciting-dynamo or other suitable source.

CD are the outer and inner sets of laminated rings, also placed in the said annular space and fitting accurately within the outer and upon the inner portion of the magnetic mass A, the lamime of each being, where necessary,

held together by bolts and keyed to the magnetie mass.

The drawings illustrate the application of this invention to a dynamo constructed on the principle of the English Patent No. 11,503 of 1888, and in this case the said laminzc 3 provided with opposing sets of polar projections 0 d, upon which are placed spools of vulcanized fiber or other insulating material carrying the secondary coils E F, which are connected with each other and the terminals, according to the eifect desired.

G is the inductor-carrier, preferably of nonmagnetic metal mounted at one end of the shaft H, which turns in a bearingin the magnetic mass A.

l are laminated inductors bolted to the carrier G and projecting into the annular space between the opposing sets of polar projections 0 (1. They are equal in number to half the number of pairs of polar projections, and are equal in width to the breadth of one polar projection and of the space between two consecutive polar projections.

We prefer wrought or good cast iron for the solid field-magnet A and fine soft iron for the laminae O D. The latter may be shaped by punching, cutting, or in any other convenient manner. The laminae of each set should be rigidly fixed together and to the field-magnet, and we prefer bolts through punched holes clear of the polar projections for the former and a key or keys for the latter purpose.

The field-magnet forging or casting may have feet or projections forming part of the magnetic mass and serving to form a bed-plate for fixing the machine. The shaft 11 has the inductor-carrier at one end and the drivingpulley at the other. Its bearing in the magnetic mass A may be lubricated by means of a longitudinal groove supplied from a lubricator through an oblique duct a, and the ends of the magnetic mass may have oil-catchers,

which are drained through oil-ducts a into certained the nature of the said invention and in whatinanner the same is to be performed, We declare that what we claim is 1. In a dynamo-electric machine, a field- 'nagnet formed by the combination of an electric conductor, formed 'of or acting as a single coil-,a single magnetizablemass snrroi'niding; the said coil on the inner and outer circumferences and on one face and extending beyond the coil at the other face, and two sets of flat rings of magnetic metal fitting in and on the prolongations of the niag'netizable mass and formed to as to give projections adapted for the particular requirements desired, substantially as specified.

In a dynamo-electric machine, a fieldmagnet. formed by the combination of an electric conductor formed of or acting as a single coil, a single magnetizable mass surrounding the said coil on the inner and enter circumferences and on one face and extending beyond the coil at the other face, and two sets of flat rings of magnetic metal fitting in and on the prolongaticns of the magnetizable mass and with secondary coils on the lieldmagnet polar extensions, and laminated ind netors adapted to revolve between the opposin; pairs of polar projections, as described.

The foregoingspecification of our improvements in. field-magnets of dynamo-electric machines signed by us tnis 12th day of Jannary, 1802c lniZaltl S SIMON MMtN S IYKE. EDWARD S'llllllllN llAltltiS.

Witnesses:

G. F. WARREN, .Nolm' Public, Lem/m1.

Josnrn LAKE, 17 (r'I'UC'PCIllLIC-h Sheri/ Lomlon, E. C. 

